An Investigation Into Energy Performance with the Integrated Usage of a Courtyard and Atrium

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An Investigation Into Energy Performance with the Integrated Usage of a Courtyard and Atrium buildings Article An Investigation into Energy Performance with the Integrated Usage of a Courtyard and Atrium Tofigh Tabesh * and Begum Sertyesilisik * Department of Architecture, Faculty of Architecture, Istanbul Technical University, Istanbul 34437, Turkey * Correspondence: [email protected] (T.T.); [email protected] (B.S.); Tel.: +90-5395158546 (T.T.); +90-5324575723 (B.S.) Academic Editor: Cinzia Buratti Received: 25 January 2016; Accepted: 29 April 2016; Published: 17 May 2016 Abstract: Offices and retail spaces are among the most energy-intensive building typologies. Designing office buildings without proper consideration of their form, orientation, envelope, and other variables can lead to a considerable increase in energy usage. This research investigates how integrated usage of an atrium and courtyard can improve a building’s energy performance. Thermal performance of both atrium and courtyard spaces as well as their energy-efficient integrated usage in office buildings have been investigated within the scope of this research. DesignBuilder as an interface and EnergyPlus (based on ASHRAE, the American Society of Heating, Refrigeration, and Air-Conditioning Engineers) as analytical software have been used to investigate the thermal behavior of an atrium and courtyard in two stages. From the results it appeared that a courtyard with 40% window-to-wall ratio and triple glazing has the best energy performance, while those with single glazing and an 80% window-to-wall ratio represent maximum energy consumption in all climates. The findings also revealed that the integrated usage of a courtyard and atrium can save energy if it is used as a courtyard type of building during summer in all climates and if it is used as an atrium in the cold months. This research is original and will contribute to the literature, as it investigates the integrated usage of an atrium and courtyard with respect to energy efficiency. This research is expected to be beneficial to professionals and academics, especially with respect to the energy-efficient use of courtyards, atria, and their integrated modes. Furthermore, the findings can contribute to the sustainability performance of the built environment through an integrated atrium-courtyard building, resulting in minimal energy consumption. Keywords: courtyard; atrium; energy-efficient buildings; integrated design 1. Introduction The energy efficiency of built environment in urban areas plays an important role in reducing the challenges of climate change, resource diminution, and wider environmental issues [1]. Building energy consumption level is expected to continue rising in the coming years [2]. Cai et al. (2009) stated that due to an improvement in living standards and rapid urbanization, there will be an increase in energy-consuming appliances (e.g., air conditioners) and urban building areas, which will further increase energy consumption [3]. For instance, Steemers (2003) highlighted that in the United Kingdom, buildings account for about half of all energy consumption, compared to 41% in Europe and 36% in the USA [1]. Offices rank second, just after retail buildings, as they consume 18% of the energy in the United States, 33% in Spain, and 17% in the United Kingdom [3]. Offices and retail spaces are among the most energy-intensive typologies in the non-domestic building sector as they account for over 50% of total energy consumption for non-domestic buildings [4]. Turkey’s energy demand has increased by about 8% annually due to population increase and economic growth [5]. Turkey is an energy-importing country due to limited energy sources [6]. In recent years, energy imports accounted for more than Buildings 2016, 6, 21; doi:10.3390/buildings6020021 www.mdpi.com/journal/buildings Buildings 2016, 6, 21 2 of 20 80% of the total primary energy supply in Turkey [7]. Within this composition, 99% of total gas demand, 93% of oil, and 55% of coal were imported from various countries [8]. Official figures project a continued increase in energy demand, with installed capacity expected to grow from 64 GW in 2014 to approximately 120 GW in 2023 [9]. Recent work on the end-use of load characteristics of high-rise air-conditioned office buildings has revealed that air-conditioning and electric lighting account for 30%–60% and 20%–35% of total building electricity consumption, respectively [10]. The annual energy consumption in European office buildings varies from 100 to 1000 kWh/m2 of conditioned floor space, depending on location, construction, HVAC and lighting installations, use and type of office equipment, operating schedules, etc. [11]. There is a need to consider passive design options (e.g., building form, orientation, and envelope) more carefully and to enhance indoor air quality by energy-efficient means. The incorporation of an atrium into commercial buildings can save energy by providing good daylight, natural ventilation, and a buffer zone between the indoor and outdoor environment. However, the large glazing surfaces of an atrium absorb excessive solar heat in the summer and lose heat in the winter. Atria and courtyards can be extremely effective at providing daylight and additional heat to adjacent spaces and in reducing transmission losses. The thermal performance of courtyard/atrium buildings depends greatly on factors (such as geometry, location, latitude, height, external climate, microclimate, etc.) that involve working with the climate rather than against it so that the need for artificial space conditioning is reduced [12]. For instance, in this research three climates of Turkey—mild/humid, cold, and hot/dry—have been taken into account. A mild/humid climate has high humidity, fog, cold winters, and low average temperatures, with a mild and often wet spring and autumn [13]. Istanbul has been selected as the representative city for the mild/humid climate. A cold climate has very cold winters with high annual snowfall. Erzurum has been selected as the representative city for the cold climate [13]. A hot/dry climate is characterized by high temperatures and high solar radiation. Diyarbakir has been selected as the representative city for the hot/dry climate [13]. There have been various studies done on courtyard and atrium design. None of these studies, however, considered energy-efficient and integrated use of atria and courtyard. There is a gap in the literature with respect to research into improving energy performance with the integrated usage of atria and courtyards. This is supported by Perez-Lombard et al. (2008), who recommend further analysis of the energy demand of non-domestic buildings such as office buildings. The current research is significant as it fills these gaps in the literature [14]. This research investigates how integrated usage of an atrium and courtyard can improve a building’s energy performance with respect to seasonal effects and climate factors. 2. Literature Review Energy efficiency is becoming more of a priority in recent years because energy consumption is becoming a crisis [15]. The commercial buildings sector consumes a huge amount of energy and its energy consumption pattern will likely increase sharply in the near future [16]. As a result, there has been a general movement towards finding effective design strategies to reduce the energy demands of buildings and encourage further awareness of energy-conscious design [17]. Gratia and Herde (2003) have stressed that passive solar energy can reduce the auxiliary heating costs in office buildings without compromising occupant comfort [18]. All aspects of the atria and courtyards in buildings (i.e., their proportion, orientation, shape and size, height, shading control, glazing type and ratio, and the thermal mass of walls) need to be carefully considered in the design phase. Poor or inappropriate design may create challenges in controlling temperature, glare, and energy consumption [19]. Most atrium and courtyard buildings depend on mechanical systems for cooling or heating throughout the year and do not take advantage of the atrium and courtyard as a tool to minimize energy consumption. Causes of dependence on mechanical systems to maintain a proper comfort level Buildings 2016, 6, 21 3 of 20 within the structure include: incorporation of atria and courtyards that are vastly less efficient than the nominal case [20], and miscalculation of the importance of controlling the factors determining the courtyard or atrium’s energy efficiency (i.e., orientation, size or ratio of atrium or courtyard to adjacent spaces, envelope constructions, and type and function of atrium or courtyard) [21]. Similarly, Atif (1994) mentioned a lack of design tools for optimizing the energy consumption in an atrium and emphasized the need for an integrated design considering all aspects of the atrium (i.e., acoustics, smoke control management, etc.)[22]. Mills (1991) stated that the problem in designing atrium buildings was the lack of available definitive guidance; most architects tend to look towards example projects for inspiration or learn through trial and error [23]. Furthermore, Mills (1991) noted that with the help of correct atrium design, the building can capture solar energy to reduce the building’s energy consumption while also creating a comfortable and visually pleasant environment [23]. There are various studies on the energy performance of the courtyards. The research mainly focused on the shape, ventilation, and energy performance of the courtyards. The main studies are briefly summarized in the following: ‚ Studies
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